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Rule Fog Hunter

Tarn Hows - Fog Hunter - Lake District

Hawkshead, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
15%
Dewpoint Spread0.7°C
Visibility22408 (Clear)
Relative Humidity95%
Wind Speed3.9m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Dense Fog
Tarn Hows
Tomorrow · 06:00–09:00 · 3h window
Medium confidence
68%
🌫️Fog Probability75-100%
Dewpoint Spread: 0.1°C
Visibility: 404 (Fog)
Relative Humidity: 99%
Wind Speed: 3.0m/s (calm conditions)
fog weather icon
Dense Fog
Tarn Hows
Sun, Jun 14 · 24:00–03:00
🌫️Fog Probability:86-100%
High
fog weather icon
Dense Fog at Dawn
Tarn Hows
Sun, Jun 14 · 03:00–04:00
🌫️Fog Probability:100%
Medium
fog weather icon
Dense Fog at Sunrise
Tarn Hows
Sun, Jun 14 · 04:00–05:00
🌫️Fog Probability:100%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create the Lake District's legendary atmospheric photography. We combine fog probability, dewpoint spread, visibility, and wind data to predict when and where mist will form over these famous lakes and valleys.

The Lake District's combination of lakes, tarns, and enclosed valleys creates ideal conditions for fog formation. Cool, calm nights allow mist to pool in valley bottoms, creating ethereal scenes at dawn that have inspired poets and photographers for centuries.

What makes the Lake District special for fog photography:

  • Lake mist - Cold water surfaces generate fog that pools over the lakes at dawn
  • Valley inversions - Mountain-ringed valleys trap mist while fells rise above
  • Romantic landscapes - This is Wordsworth and Turner country, with timeless views
  • Accessible locations - Well-maintained paths reach viewpoints above the fog layer

Peak fog season runs from late August through October, when temperature differentials are greatest. The best conditions typically occur on calm, clear nights when temperatures drop near dewpoint. Arrive before dawn—lake mist often lifts within an hour or two of sunrise. Higher viewpoints like Catbells or Loughrigg offer shots looking down at fog-filled valleys.

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72-hour requirements breakdown

What passed or failed, hour by hour
3matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Fri, Jun 5
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sat, Jun 6
24:000%
01:000%
02:000%
03:000%
04:000%
05:0026%
06:000%
07:000%
08:0021%
09:0015%
10:0015%
11:000%
12:000%
13:000%
14:0069%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:0055%
Sun, Jun 7
24:0055%
01:0069%
02:0058%
03:0071%
04:0073%
05:0073%
06:00100%
07:00100%
08:0075%
09:0017%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0023%
21:0023%
22:0026%
23:0018%
Mon, Jun 8
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0018%
20:000%
21:000%
22:000%
23:000%
Tue, Jun 9
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Europe/London
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Sat, Jun 6 Sunrise 04:40 Sunset 21:41
09:00
0% 7.4°C 0.37mm 95% 0cm 34° 8.1°C 0.44mm 0.05kPa 22408m 11m/s 3.9m/s
10:00
0% 7.4°C 0.22mm 96% 0cm 42° 8°C 0.69mm 0.04kPa 24134m 11m/s 3.9m/s
11:00
0% 7.7°C 0.14mm 97% 0cm 50° 8.1°C 1mm 0.04kPa 24134m 10m/s 3.9m/s
12:00
0% 8.1°C 0mm 98% 0cm 56° 8.4°C 1.1mm 0.03kPa 788m 9.4m/s 3.1m/s
13:00
0% 8.9°C 0.01mm 97% 0cm 58° 9.4°C 1.1mm 0.04kPa 298m 6.4m/s 2.2m/s
14:00
0% 9.5°C 0mm 96% 0cm 57° 10°C 0.13mm 0.05kPa 996m 4m/s 1.6m/s
15:00
0% 9.7°C 0.01mm 93% 0cm 52° 11°C 0.25mm 0.09kPa 17158m 2.4m/s 1.3m/s
16:00
0% 9.9°C 0.01mm 92% 0cm 45° 11°C 0.44mm 0.11kPa 24135m 1.8m/s 1.2m/s
17:00
0% 10°C 0.01mm 93% 0cm 37° 11°C 0.44mm 0.1kPa 24134m 1.6m/s 1.6m/s
18:00
0% 10°C 0mm 94% 0cm 29° 11°C 0.5mm 0.07kPa 24134m 1.9m/s 1.7m/s
19:00
0% 10°C 0mm 94% 0cm 20° 11°C 0.56mm 0.08kPa 24134m 1.9m/s 1.7m/s
20:00
2% 9.9°C 0mm 94% 0cm 12° 11°C 0mm 0.08kPa 24135m 1.5m/s 1.5m/s
21:00
5% 9.4°C 0mm 94% 0cm 4.1° 10°C 0mm 0.08kPa 24135m 1.2m/s 1.3m/s
22:00 ☾
7% 9.2°C 0mm 94% 0cm -2.6° 10°C 0mm 0.08kPa 24135m 1.2m/s 1.3m/s
23:00 ☾
5% 9°C 0.01mm 95% 0cm -7.9° 9.8°C 0mm 0.06kPa 24135m 1.4m/s 1.6m/s
Sun, Jun 7 Sunrise 04:40 Sunset 21:41
24:00 ☾
3% 9.3°C 0mm 96% 0cm -11° 10°C 0.06mm 0.05kPa 24134m 1.5m/s 1.7m/s
01:00 ☾
1% 9.4°C 0mm 97% 0cm -13° 9.8°C 0.06mm 0.03kPa 10842m 2.4m/s 2.1m/s
02:00 ☾
1% 9°C 0mm 97% 0cm -12° 9.5°C 0.06mm 0.04kPa 24135m 2.5m/s 2.1m/s
03:00 ☾
0% 7.3°C 0mm 97% 0cm -9.4° 7.7°C 0.06mm 0.03kPa 24135m 2.2m/s 2.5m/s
04:00 ☾
0% 7.5°C 0.01mm 99% 0cm -4.7° 7.7°C 0.06mm 0.01kPa 19742m 3.2m/s 2.8m/s
05:00
0% 8.2°C 0mm 99% 0cm 1.7° 8.4°C 0.06mm 0.01kPa 24135m 4.1m/s 2.9m/s
06:00
0% 8.8°C 0mm 99% 0cm 8.8° 8.9°C 0.06mm 0.01kPa 404m 5.5m/s 3m/s
07:00
0% 9.9°C 0mm 99% 0cm 17° 10°C 0.13mm 0.01kPa 197m 7.2m/s 3.2m/s
08:00
0% 10°C 0mm 98% 0cm 25° 11°C 0.13mm 0.03kPa 434m 9.2m/s 3.9m/s
09:00
0% 10°C 0mm 96% 0cm 34° 11°C 0.25mm 0.05kPa 22361m 9.6m/s 5m/s
10:00
0% 10°C 0mm 93% 0cm 43° 11°C 0.38mm 0.1kPa 22566m 11m/s 5.7m/s
11:00
0% 11°C 0mm 94% 0cm 50° 12°C 0.56mm 0.09kPa 19858m 11m/s 6.2m/s
12:00
0% 11°C 0mm 92% 0cm 56° 12°C 0.75mm 0.11kPa 19267m 13m/s 7.2m/s
13:00
0% 11°C 0mm 89% 0cm 58° 13°C 1mm 0.17kPa 19555m 14m/s 8.4m/s
14:00
0% 12°C 0mm 89% 0cm 57° 14°C 0.5mm 0.18kPa 12258m 15m/s 10m/s
15:00
0% 12°C 0mm 89% 0cm 52° 14°C 0.94mm 0.18kPa 10927m 15m/s 10m/s
16:00
0% 12°C 0mm 89% 0cm 45° 14°C 1.3mm 0.18kPa 15054m 15m/s 9.4m/s
17:00
0% 12°C 0mm 91% 0cm 37° 13°C 1.8mm 0.14kPa 11975m 15m/s 9.3m/s
18:00
0% 12°C 0.01mm 94% 0cm 29° 13°C 2.4mm 0.09kPa 5767m 14m/s 7.8m/s
19:00
0% 11°C 0.02mm 96% 0cm 20° 12°C 2.9mm 0.06kPa 5964m 12m/s 6m/s
20:00
1% 11°C 0mm 96% 0cm 12° 12°C 0.25mm 0.05kPa 7068m 11m/s 4.9m/s
21:00
1% 11°C 0mm 97% 0cm 4.2° 11°C 0.5mm 0.04kPa 7408m 10m/s 4.4m/s
22:00 ☾
2% 11°C 0mm 97% 0cm -2.5° 11°C 0.69mm 0.04kPa 9906m 10m/s 4.7m/s
23:00 ☾
1% 11°C 0.13mm 96% 0cm -7.8° 11°C 0.88mm 0.05kPa 17445m 12m/s 5.2m/s
Mon, Jun 8 Sunrise 04:40 Sunset 21:42
24:00 ☾
1% 10°C 0.07mm 97% 0cm -11° 11°C 1.1mm 0.03kPa 22527m 9.6m/s 3.8m/s
01:00 ☾
0% 10°C 0.63mm 97% 0cm -13° 10°C 1.6mm 0.03kPa 12072m 8.8m/s 4.1m/s
02:00 ☾
0% 10°C 2.1mm 99% 0cm -12° 10°C 1.4mm 0.01kPa 313m 8.7m/s 3.6m/s
03:00 ☾
0% 11°C 2.2mm 99% 0cm -9.3° 11°C 4mm 0.01kPa 127m 9.8m/s 4.3m/s
04:00 ☾
0% 11°C 3.4mm 99% 0cm -4.6° 11°C 6.3mm 0.01kPa 127m 9.6m/s 4.3m/s
05:00
0% 10°C 0.81mm 98% 0cm 1.8° 10°C 9.3mm 0.02kPa 222m 12m/s 5.2m/s
06:00
0% 9.9°C 0.57mm 98% 0cm 8.8° 10°C 9.9mm 0.02kPa 219m 12m/s 6m/s
07:00
0% 9.7°C 0.26mm 98% 0cm 17° 10°C 10mm 0.02kPa 401m 11m/s 4.7m/s
08:00
0% 10°C 1.1mm 98% 0cm 25° 10°C 1.3mm 0.02kPa 300m 9m/s 4m/s
09:00
1% 10°C 1.2mm 99% 0cm 34° 10°C 3.4mm 0.02kPa 212m 11m/s 4.8m/s
10:00
1% 10°C 0.03mm 98% 0cm 43° 10°C 3.9mm 0.03kPa 359m 11m/s 5.1m/s
11:00
1% 11°C 1.8mm 98% 0cm 50° 11°C 4.7mm 0.03kPa 3538m 12m/s 5.7m/s
12:00
2% 9.5°C 0.27mm 96% 0cm 56° 10°C 8.9mm 0.04kPa 12357m 12m/s 6.3m/s
13:00
2% 7.7°C 0.03mm 94% 0cm 58° 8.7°C 9.1mm 0.07kPa 10330m 11m/s 8.1m/s
14:00
17% 6.9°C 0.02mm 93% 0cm 57° 7.9°C 6.1mm 0.07kPa 14932m 8.4m/s 6.4m/s
15:00
33% 6°C 0.01mm 93% 0cm 53° 7.1°C 3.1mm 0.07kPa 19533m 6.2m/s 4.7m/s
16:00
48% 5.2°C 0mm 92% 0cm 46° 6.4°C 0.06mm 0.07kPa 24135m 4.1m/s 3.1m/s
17:00
49% 5.6°C 0.17mm 93% 0cm 37° 6.6°C 0.35mm 0.07kPa 19378m 5.9m/s 3.4m/s
18:00
50% 6°C 0.34mm 94% 0cm 29° 6.9°C 0.65mm 0.06kPa 14621m 7.8m/s 3.7m/s
19:00
51% 6.4°C 0.51mm 95% 0cm 20° 7.2°C 0.94mm 0.05kPa 9864m 9.6m/s 4m/s
20:00
51% 6.1°C 0.36mm 94% 0cm 12° 6.9°C 1.2mm 0.06kPa 14621m 9.9m/s 4.4m/s
21:00
52% 5.7°C 0.22mm 94% 0cm 4.3° 6.7°C 1.5mm 0.06kPa 19378m 10m/s 4.8m/s
22:00 ☾
52% 5.4°C 0.07mm 93% 0cm -2.4° 6.4°C 1.8mm 0.07kPa 24135m 10m/s 5.2m/s
23:00 ☾
46% 5.4°C 0.1mm 92% 0cm -7.7° 6.6°C 1.9mm 0.07kPa 23307m 10m/s 5.4m/s
Tue, Jun 9 Sunrise 04:39 Sunset 21:43
24:00 ☾
41% 5.5°C 0.12mm 92% 0cm -11° 6.7°C 2mm 0.08kPa 22478m 10m/s 5.6m/s
01:00 ☾
35% 5.5°C 0.15mm 91% 0cm -13° 6.9°C 2.2mm 0.09kPa 21650m 9.9m/s 5.8m/s
02:00 ☾
29% 5.7°C 0.1mm 92% 0cm -12° 7°C 1.8mm 0.08kPa 18926m 10m/s 6.5m/s
03:00 ☾
24% 5.9°C 0.05mm 92% 0cm -9.2° 7.1°C 1.4mm 0.08kPa 16203m 11m/s 7.3m/s
04:00 ☾
18% 6.1°C 0mm 93% 0cm -4.6° 7.1°C 1.1mm 0.07kPa 13480m 12m/s 8m/s
05:00
15% 6.6°C 0.05mm 93% 0cm 1.8° 7.7°C 1.4mm 0.08kPa 13532m 12m/s 8.2m/s
06:00
11% 7.1°C 0.11mm 92% 0cm 8.9° 8.2°C 1.8mm 0.08kPa 13584m 12m/s 8.3m/s
07:00
8% 7.5°C 0.16mm 92% 0cm 17° 8.7°C 2.2mm 0.09kPa 13637m 12m/s 8.4m/s
08:00
11% 7.3°C 0.14mm 89% 0cm 26° 9°C 1.8mm 0.12kPa 15732m 12m/s 8.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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